Proto J4709DPL Spline Socket 1/4 in Drive 9/32 in Hex Deep

Product Description

The PROTO J4709DPL is a deep spline socket designed for professional fastener removal and installation. Built for a 1/4 inch drive, it accepts a 9/32 inch hex and features a 12-point spline configuration — Size 9 spline — making it well suited for confined spaces where standard sockets lose grip. The deep profile allows engagement on longer fasteners and recessed bolt heads. Licensed mechanics, HVAC technicians, pipefitters, and electricians reach for deep spline sockets when standard-depth tools cannot reach the fastener or when extra torque control is needed on stubborn hardware.

This socket fits standard 1/4 inch drive ratchets, extensions, and torque wrenches. The deep well profile is commonly used in tight engine bays, panel enclosures, valve assemblies, and mechanical equipment where fasteners sit below a surface or on threaded studs. It is equally at home on light commercial equipment, residential HVAC units, and electrical panels where 9/32 inch hex fasteners appear. The 12-point contact geometry allows the socket to seat at multiple angles, useful in restricted access situations where full ratchet swing is not possible.

Key Features

• 1/4 inch drive fits standard ratchets, extensions, and torque wrenches
• 9/32 inch hex size with Size 9 spline designation for precise fastener engagement
• Deep socket profile reaches recessed bolts and extended studs
• 12-point contact geometry allows seating at multiple angles in tight spaces
• Compact overall weight of 0.05 pounds for reduced hand fatigue during overhead or confined work

Compatibility

Designed as an OEM-style replacement deep spline socket compatible with standard 1/4 inch drive tool systems.

Installation Notes

This socket is installed and used by mechanics, HVAC technicians, electricians, and general maintenance trades. Always ensure the drive square is fully seated in the ratchet or extension before applying torque to prevent slippage or socket ejection. Power down or de-energize any equipment before fastening or loosening hardware on electrical or mechanical assemblies. Inspect the socket for cracks or wear before use and replace if the spline contact points show rounding.